|Table of Contents|

Crossing pressure wave characteristics of high-speed trains in tunnel(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2015年05期
Page:
34-43
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Crossing pressure wave characteristics of high-speed trains in tunnel
Author(s):
MEI Yuan-gui;  SUN Jian-cheng;  XU Jian-lin;  ZHOU Chao-hui
School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
Keywords:
high-speed trains;  tunnel;  crossing pressure wave;  aerodynamic loads;  numerical simulation
PACS:
U270.11
DOI:
-
Abstract:
The geometric model of train and 3D unsteady-compressible turbulence model were set up by using the computational fluid dynamics(CFD)software based on the finite volume method(FVM), and the whole crossing processes of high-speed trains were simulated in constant-speed and variable-speed conditions. The smooth starting method was coupled into the moving mesh technique of arbitrary sliding interface(ASI)to study the pressure fluctuation characteristics, the air velocity varition and the forming processes of pressure waves at tunnel sections in the whole crossing processes. Study result shows that the pressure fields and velocity fields in high-speed trains passing process in tunnel are clearly depicted via the 3D fluid flow model. Though the pressure fluctuation trends of monitoring points at a tunnel cross section are consistent with that of cross-section average pressure, the pressure differences of monitoring points are considerably high, and the maximal difference is 53.5%. The pressure fluctuation amplitude at the middle section of tunnel is largest in constant-speed crossing, and the negative pressure peak value is about -7 kPa. In constant-speed crossing, when the speed of lower-speed train decreases, the peak values of positive and negative pressures for higher-speed train decrease, while the positive pressure peak value of lower-speed train is about 1.5 kPa higher than that of higher-speed train. The negative pressure peak value at the cross section where two train noses meet together is proximately direct proportional to the speed square of lower-speed train. 1 tab, 25 figs, 19 refs.

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Last Update: 2015-10-20